Futures trading halted by government to prevent unrest?

The government of India has made the controversial decision to halt all futures trading on valuable, life sustaining commodities such as wheat and rice . . . in an effort to quell panic and temporarily stop the rampant speculation on the severity of shortages . . . Should the U.S. government be able to do the same in times of emergency . . . or if appears market conditions could lead to civil unrest? Keep in mind . . . the NYSE has in place emergency protocols for shut down should market decline be affected "Acts of God . . ." Reference shut down post 9/11 . . . Since the NYSE can temporarily shut down the market during decline, should they be able to shut down the markets during rampant, speculative inclines?